Did your teacher give you a specific video, or can you choose the video yourself? Here's one idea.
Here is a YouTube video:
In your introduction, say what kind of video it is. Is it a song? Is it a history lesson? Is it an animated cartoon?
A newspaper story answers the questions "who," "what," "where," "why," and "when." Do you think you should answer some of these questions? Who is this video about? What are they doing? Where are they doing it?
Don't try to tell the whole story of what is in the video. It would be too long. Why would anyone read it instead of watching the video?
Is the video sad or funny? Is it educational or just entertaining? Is the video long or short? It is reasonable to say how many minutes long it is.
What language do the characters speak? Do you need a translation? <---Trick questions!
What kind of animation is it? Drawings, like old Disney cartoons? Claymation, like the Godzilla movies? Computer-generated imaging, with everything looking solid and realistic?
Imagine someone reading your report. If they read your report, and then they know whether or not they want to watch the video, you wrote a good report.